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137.180 Self-rising flour.

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[Code of Federal Regulations]
[Title 21, Volume 2]
[Revised as of April 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR137.180]

[Page 374-375]
                        TITLE 21--FOOD AND DRUGS
                          SERVICES (CONTINUED)
   Subpart B_Requirements for Specific Standardized Cereal Flours and 
                            Related Products
Sec.  137.180  Self-rising flour.

    (a) Self-rising flour, self-rising white flour, self-rising wheat 
flour, is an intimate mixture of flour, sodium bicarbonate, and one or 
more of the acid-reacting substances monocalcium phosphate, sodium acid 
pyrophosphate, and sodium aluminum phosphate. It is seasoned with salt. 
When it is tested by the method prescribed in paragraph (c) of this 
section not less than 0.5 percent of carbon dioxide is evolved. The 
acid-reacting substance is added in sufficient quantity to neutralize 
the sodium bicarbonate. The combined weight of such acid-reacting 
substance and sodium bicarbonate is not more than 4.5 parts to each 100 
parts of flour used. Subject to the conditions and restrictions 
prescribed by Sec.  137.105(a), the bleaching ingredients specified in 
such section may be added as optional ingredients. If the flour used in 
making the self-rising flour is bleached, the optional bleaching 
ingredient used therein (see Sec.  137.105(a)) is also an optional 
ingredient of the self-rising flour.
    (b) Label declaration. Each of the ingredients used in the food, 
shall be declared on the label as required by the applicable sections of 
parts 101 and 130 of this chapter.
    (c) The method referred to in paragraph (a) of this section is the 
method prescribed in ``Official Methods of Analysis of the Association 
of Official Analytical Chemists'' (AOAC), 13th Ed.

[[Page 375]]

(1980), section 8.002, ``Reagent (Displacement soln.),'' and section 
8.003, ``Chittick apparatus,'' under the heading ``Total Carbon Dioxide 
(1)--Official Final Action,'' which is incorporated by reference. Copies 
may be obtained from the AOAC INTERNATIONAL, 481 North Frederick Ave., 
suite 500, Gaithersburg, MD 20877, or may be examined at the National 
Archives and Records Administration (NARA). For information on the 
availability of this material at NARA, call 202-741-6030, or go to:
regulations/ibr--locations.html.The following procedure is substituted 
for the procedure specified in the AOAC, under section 8.004, 
    (1) Weigh 17 grams of the official sample into flask A, add 15-20 
glass beads (4-6 mm. diameter), and connect this flask with the 
apparatus (fig. 22). Open stopcock C and by means of the leveling bulb E 
bring the displacement solution to the 25 cc. graduation above the zero 
mark. (This 25 cc. is a partial allowance for the volume of acid to be 
used in the decomposition.) Allow the apparatus to stand 1-2 minutes to 
insure that the temperature and pressure within the apparatus are the 
same as those of the room. Close the stopcock, lower the leveling bulb 
somewhat to reduce the pressure within the apparatus, and slowly run 
into the decomposition flask from burette F 45 cc. of sulfuric acid 
(1+5). To prevent the liberated carbon dioxide from escaping through the 
acid burette into the air, keep the displacement solution in the 
leveling bulb at all times during the decomposition at a lower level 
than that in the gas-measuring tube. Rotate and then vigorously agitate 
the decomposition flask for three minutes to mix the contents 
intimately. Allow to stand for 10 minutes to bring to equilibrium. 
Equalize the pressure in the measuring tube by means of the leveling 
bulb and read the volume of gas from the zero point on the tube. Deduct 
20 cc. from this reading (this 20 cc. together with previous allowance 
of 25 cc. compensates for the 45 cc. acid used in the decomposition). 
Observe the temperature of the air surrounding the apparatus and also 
the barometric pressure and multiply the number of mL of gas evolved by 
the factor given in section 52.007, ``Correction factors for gasometric 
determination of carbon dioxide,'' AOAC, 13th Ed. (1980), which is 
incorporated by reference (the availability of this incorporation by 
reference is given in paragraph (c) of this section), for the 
temperature and pressure observed. Divide the corrected reading by 100 
to obtain the apparent percent by weight of carbon dioxide in the 
official sample.
    (2) Correct the apparent percent of carbon dioxide to compensate for 
varying atmospheric conditions by immediately assaying a synthetic 
sample by the same method in the same apparatus.
    (3) Prepare the synthetic sample with 16.2 grams of flour, 0.30 gram 
of monocalcium phosphate, 0.30 gram of salt, and a sufficient quantity 
of sodium bicarbonate U.S.P. (dried over sulfuric acid) to yield the 
amount of carbon dioxide recovered in assay of official sample. 
Determine this quantity by multiplying weight of carbon dioxide 
recovered in assay of official sample by 1.91.
    (4) Divide the weight of carbon dioxide recovered from synthetic 
sample by weight of carbon dioxide contained in sodium bicarbonate used.
    (5) Divide the quotient into the apparent percent of carbon dioxide 
in official sample to obtain percent of carbon dioxide evolved from the 
official sample.

[42 FR 14402, Mar. 15, 1977, as amended at 47 FR 11827, Mar. 19, 1982; 
49 FR 10097, Mar. 19, 1984; 54 FR 24894, June 12, 1989; 58 FR 2877, Jan. 
6, 1993]

Additives that reference this regulation:

Source: U.S. Code of Federal Regulations - CFR Title 21, Part 137, Section 180

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